Lock.



M. GOLDSIEIN LOCK.

APPLICATION FILED JAN. 7, 1909.

921,232., Patented May 11, 1909.

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UNITE %TATE% PATENT MARTIN GOLDSTEIN, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONE-HALF TO GEORGE TRUSCOTT, OF MINNEAPOLIS, MINNESOTA.

LOCK.

No. 921,232. Specification of Letters Patent. Patented May 11, 1909.

Application filed January'i, 1909. Serial No. 471,083.

I all whom it may concern:

Be it known that I, ll/IARTIN GOLDSTEIN, a citizen of the United States, residing at Minneapolis, in the county of l-lennepin and State of Minnesota, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap pertains to make and use the same.

My invention has for its especial object to provide an improved door lock, and to this end, it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a front edge elevation of the improved lock; Fig. 2 is a side elevation of the lock, with some parts removed and with some parts broken away, and showing the lock bolt projected; Fig. 3 is a fragmentary view in side elevation, showing the lock bolt in its normal position; and Fig. l is a vertical section taken on the line r :c of 2, some parts being broken away.

The lock case 1, as is customary, is pro vided at its front or outer edge with a vertically extended face plate 2, but as a novel feature, it is provided with spring metal sides 3 having small inwardly projecting detents or shoulders 1, the purpose of which will hereinafter appear. Also at its lower por tion, the case is provided with an upright centrally located partition plate 5 the is located between the lower key holes 6, and is provided with a guide pin 7 alined with said key holes.

The key which is of special construction, is indicated by the numeral 8, and is provided with an irregular formed blade 8 and with a tubular inner end. The blade 8 is adapted to be inserted at either side of the look through either one of the key holes 6, and its tubular end is adapted to be telescoped over the guide pin 7 of the partition plate 5, as shown in Fig. 1.

The numeral. 9 indicates a latch bolt which is mounted in the lock case in the usual way,

the back of the lock case at 12, engages the inner end of the latch bolt 9 and yieldingly presses the same outward. The lock bolt proper, which is indicated by the numeral 13, is also mounted in the lock case in substan tially the usual way, but is arranged to be locked and to be moved by novel means which will now be described.

1 Preferably the lock bolt 13 at its inner end,

flange 15 secured to the back of the lock case 1. At its lower edge, near its inner end, the lock bolt 13 is provided with quite large clearance notch 16, which in both positions of the lock bolt, affords clearance for the blade 8* of the key 8. Substantially the entire inwardly projecting portion of the lock bolt 13 is bifurcated or split vertically, so that in fact, the notch 16 is formed in the two prongs or laterally spaced portions thereof. In its upper edge, the lock bolt 13 is provided with two lock notches 17 and 13 formed as shown, in part in both of the laterally spaced portions of the said lock bolt.

When the lock bolt is projected or moved into its operative position as shown in Fig. 2, the notch 17 or rather the two parts of the said notch, are engaged by the laterally ex tended upright lock flange 19 of a lock plate 20, which latter at its forward end, is pivotally connected at 21 to the face plate or flange 2 of the lock case. lVhen the lock bolt 13 is in its innermost or inoperative position shown in Fig. 3, the said lock flange 19 engages the notch 18, or rather the two parts of the said notch. It should be here noted, that the lower prong of the spring 11 engages the lock flange 19, and yieldingly presses the same downward. The pivoted lock plate is provided with laterally spaced vertical webs 22, the lower edges of which are approximately horizontal and co-incident with the lower edge of the lock bolt 13. These webs 22 straddle the partition late 5, and he immediately within the later-a ly spaced portions of the said bolt 13, as best shown in Fig. 4.

Pivoted to each side of the lock bolt 13 at 23, is a dog 24 provided in its lower edge with a notch 25. The free rearwardly extended ends of these dogs 24, when forced upward, are adapted to be engaged and held upward by the detents or shoulders 4 of the adjacent spring sides 3 of the lock case, as shown in Figs. 2 and l. Springs 26, shown as attached has a slot 14 that works on a projecting guide 1 to the face plate of the lock case, engage the free ends of the dogs 24, and yieldingly press the same downward. The downward movements of the dogs 24, are, as shown, limited by stop pins 27 on the bolt 13, (see Fig. 3). ilhe operation of the improved lock is as folows:

When the lock bolt 13 is in its normal or innermost position, the key is inserted as shown in Fig. 3, and then rotated in the direction of the arrow thereon in Fig. 3, the key blade 8 will engage the adjacent dog 24 and raise the same until the key blade is alined with the notch 25 of said dog, whereupon the said dog will drop again, downward to its normal position. Simultaneously with this movement, the key blade engages the adjacent web 22 of the lock plate 20, and raises the lock flange 19 out of engagement with the bolt notch 18, and thus releases the bolt 13 so that it will be forced. outward by further rotation of the key in the direction above stated. Before the lock bolt 13 has been forced to its outer position, the key blade 8 by its downward movement, ermits the lock blade 20 to drop so that its lbck flange 19 will be engaged with the lock notch 17 of said lock bolt, as soon as the said lock bolt reaches its extreme outermost position. When the dog 24 was raised as above stated, by the blade of the key, its free end was forced upward above the cooperating detent 4, and the said lock dog was therefore locked in its uppermostposition. If now the key inserted from the same side of the lock case be rotated, it will, under each rotation, raise the lock plate 20 and. its lock flange 19, but will not engage the notch 25 of the raised lock dog 24, and. hence, the key will be ineffective 011 the lock bolt, and the lo ck bolt will remain in its locked position. Before the lock bolt 13 can be returned to its innermost or inoperativeposition, the raised lock dog must be released from the cooperating detent i. This may be done by pulling outward on the key, and forcing the key blade 8 under outward drawing pressure against the adjacent spring side or plate 3, and thereby moving the said detent 4 laterally out from under i the free end of said lock dog, and thus releasin the said dog.

hen the lock dogs are in their lowermost position, the key may be inserted from either side of the lock, and by backward turning movement, may be engaged with the notch 25 of the lock dog 24 which is on that side of the lock, and the lock bolt may then be forced inward by rotation of the key in a direction reverse from that indicated by the arrow marked thereon in F ig. 3. .VVhen the lock bolt has been moved outward and the lock dog 24 on one side of the lock raised and held by the cooperating detent 4, the lock cannot be unlocked from the opposite side of the door to which the lock is applied. It will, of course, be understood, that for (infer ent locks, the blade 8 of the key will have different forms and the key holes 6 in the lock plates 8 will be correspondingly formed.

What I claim is:

1. The combination with a lock case, of a lock bolt slidably mounted in said case, said lock bolt having a notch adapted to clear the blade of the inserted key, a notched lock dog pivoted to said lock bolt within said case, a yielding detent adapted to hold said dog in an inoperative position, and a bolt lock engageable with notches in said lock bolt, and which dog and lock bolt are adapted to be approximately simultaneously moved into inoperative positions by the blade of the inserted key, and which detent is adapted to be moved into a releasing position by manipulation of said key.

2. The combination with a lock case having a partition plate, of a bifurcated lock bolt slidably mounted in said case and arranged to straddle said partition plate, said lock bolt having a notch adapted to clear the blade of the inserted key, a pair of notched dogs pivo tally connected to the opposite sides of said lock bolt within said case, yielding detents on the sides of said lock case adapted to hold said dogs in inoperative positions, and a lock engageable with notches of said lock bolt, and which dogs and bolt lock are adapted to be simultaneously moved into inoperative positions by the blade of an inserted key, substantially as described.

In testimony whereof I ar'liX my signature in presence of two witnesses.

MART-1N GOLDSTEIN.

VVltDGSSQS H. D. KILGORE, F. D. MERCHANT. 

